bundy



E. J. BUND Y.

COLLAPSIBLE CORE.

I APPLICATION FILED MAR. I7. I9I9- 1,307,435.

Patented June 24, 1919" 2 SHEETS-SHEET I.

' E. J. BUNDY.

COLLAPSIBLE CORE. APPLICATION HLED MAR. II. I9I9- 1 307,435 Pix tented June 24, I919.

2 SHEETS-SHEET 2.

sections and 23 is the third section comp UNITED S T-as ELMEB. :r. BUNDY, orEAsr PALESTINE,

RUBBER COMPANY, OF EAST PALESTINE, OHIO,"A

P ENT cri ical OI-IIO, AssIeNoa To TEE MQGRAW TIRE, &

coaronn'rron or onro.

GOLLAIPSIBLE CORE.

Application filed March 17, 1919. Serial No. 283,059.

To allwhom it may concern:

Be it known that I, ELMER .J. BUNDY,

a citizen of the United States, residing at East Palestine, in the county of Columbiana and State of Ohio, have invented certain new and useful Improvements in Collapsible Cores; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains, to make and use the same.

.My invention relates to collapsible cores for the making and curing of pneumatic tires. Its object is to provide a core which may be easily and quickly assembled or broken. The core has no detached or spare parts so that not only may it be quickly collapsed to be stripped from the tire, but also time and labor will be saved and the core will have a longer life. To this end my invention comprises the parts and combinations of parts recited in the appended claims.

In the accompanying drawings Figure 1 is a plan'view with the position of various parts indicated in dotted lines;

Fig. 2 is an edge view;

Fig. 3 is an enlarged broken detail of the key-section for joining and locking together the several sections of the core;

Fig. 4 is a section on line 4-4 of Fig. 1;

Fig. 5 is a detailed plan of one of the locking hooks;

Figs. 6 to 11 are details.

In the drawings, 20 represents a key section, that is, the section which is first removed when the core is to be taken from the vulcanized tire. 21 and 22 are adjoining et- At each end of the section 23 are dowel-pins, 24 and 25, taking into cor responding recesses 26 and 27 in the adjacent end of the sections 21 and 22.

28, 29, 30 and 31 represent a series of hooks playing in corresponding recesses 1n the inner periphery of the core. Each hook is pivoted on a bolt which has an eccentric formed upon its shaft. The bolts are lettered in succession 32, 33, 34 and 35, beginning with that in section 23. These bolts are shown in detail in Figs. 8 and 9, the eccentric boss on each bolt being indicated by the numeral 36, the bolts are adapted to pass through perforations in the core and to be secured by a nut on the threaded end ing the core.

of each bolt as illustrated in Fig. 4. Each of the bolts can be adjusted by applying a wrench to the head. to takeup any wear.

The engaging end. of the hook takes over a bolt adapted to be secured to the core in the manner just described with reference to the bolts 32-35, and, therefore, not necessary to illustrate specifically. These bolts in the succession before indicated are numbered 37, 38, 39, and 40. Each of these bolts also bears an eccentric boss 41, as shown in Figs. 5 and 6, so that when a hook is turned on its pivot hinge by being hammered in at the hook end to engage the bolt 37, for example, the effect of the turning of the hinge perforation on the eccentric 41 will be to draw to- 'ether the adjoining sections, leaving them still slightly separated as they are illustrated in Fig. 1.

In the key section 20, centrally located, is a shaft 42 with a wrench-receiving head 43, and at the opposite end a head 44 carrying pins 45 and 46. The pin 45 also passes through one end of a link 47 on one side while the pin 46 passes through one end of a link 48 on the other side. At the outer end of the links 47 and 48 are dowel-pins 49 and 50 secured to the links by bolts 51 and 52, and taking respectively into recesses 53 and 54 in the adjacent sections 21 and 22 of the core.

55 represents a tapering bolt with a threaded head which is screwed into a threaded seat in the top of the key-section 20, its opposite head forming a stop against which presses the head 44 of the operating shaft 42.

When a wrench is applied to the head 43 the head 44 and the links 47 and 48 operate, as would a crank, wrist-pin and link connection, to simultaneously draw in the dowelpins 49 and 50 or to project them into the recesses 53 and 54.

To guide an inexperienced operator I provide a notch 56 in the key-section and a pin 57 on the shaft 42 so that the shaft can turn only within the limit determined by the period.

In breaking up the core, I insert the point of an appropriate tool in the notch 58 in one of the hooks, having previously loosened the bolt 38, for example. This swings each hook upon its pivot so that they may be laid back, unlocking the sections 21, 22, and 23.

I now apply the wrench to the bolt head posite ends of section 23.

4:3 and turn it as far as notch 56 and the mits me to remove the key-section20 and then the other sections.

In operating the bolts 32-35 to bring the eccentric boss 36 to bear against the operative curve of the corresponding hook I find it expedient to provide means for determining the necessary turn'to be given the wrench so that especially skilled or careful attention will not be required. To this end I provide slots 59, 60, 61 and 62 of appropriate length, one in the head of each of the bolts 37 10.

Pins 63, 64, 65 and 66 project from the core into these slots, each forming a stop, so that the operator simply turns the wrench to cause a hook to turn upon the corresponding eccentric boss d1, drawing together the coupled sections, and stops when the opposite end of a slot, 59 for example, strikes the corresponding pin 63 projecting from the core-section.

It should be observed that in addition to the functions I have enumerated the eccentric bosses on the bolts 32, 83, 34 and 85 take up any wear that may affect the hooks so that at all times the sect-ions may be drawn together in the same degree, and so that, finally, they may always betightly joined.

It will be observed that sections 20 and 23 carry the'pivot bolts for the hooks, and that the bolts over which the engaging ends of the hooks take are at opposite ends of the sections 21 and 22. In assembling, the ends of sections 21 and 22 are brought up to op- Then when the hooks 28 and 29 are turned over and hammered in, the immediate effect is to draw together the sections as shown. The keysection is put in place and the hooks 30 and 31 are hammered in, each hook taking over a corresponding bolt and the eccentric boss on each bolt serving to draw together all the sections. The key-section is locked in place by the action of the shaft 42 and the crank and wrist-pin connection as described.

I claim,

1. In a collapsible core, the combination with sections, of a hook pivoted in one section and a bolt with an eccentric bearing surface in the adjacent section with which the hook engages.

2. In a collapsible core, the combination of sections, bolts secured in the sections, the

Copies of this patent may be obtained for five cents each, by addressing the bolts having eccentric bearing surfaces formed upon them and hooks pivoted in one section and engaging a bolt in an adjacent section to draw the sections together.

3. In a collapsible core, the combination with sections, of a hook, a bolt in one section having an eccentric bearing surface, the hook being pivoted upon one bolt and engaging the other bolt.

4. In a collapsible core, a series of sections, hooks pivoted in one section and adapted to engage the adjacent section and to draw together the two sections, a key section, hooks pivoted to the key section and adapted to engage the adjacent sections to draw them and the key section together, and means for securing the key section to the adjacent sections.

5. In a collapsible core, the combination with a series of sections, of hooks, bolts passing through one end of some of the sections adapted to be engaged by the hooks and having an eccentric boss formed thereon, and a slot and pin device to limit the turning of the bolt.

'6. In a collapsible core, the combination of a shaft, links extending at a right angle from the shaft, dowel-pins connected to the links, and a regulating pin screwed in to the section and opposing the head of the shaft.

7. In a collapsible core, a bolt with an eccentric surface to form a pivot for a securing hook and adapted to be operated by a wrench to, adjust the eccentric to take up Wear.

8. In a collapsible core, the combination of a series of sections and a key section, a shaft located substantially central of the key section, a crank and a wrist-pin mechanism operated by the shaft, and dowel-pins adapted to connect the key sec tion and the adjacent sections and operated by the shaft and crank and wrist-pin connection.

9. A collapsible core comprising four sections, one section having pivot bolts, hooks pivoted to the bolts at opposite ends of the section, two of the sections having bolts which receive the engaging ends of the hooks, a key section having pivot bolts, hooks pivoted upon the bolts at opposite ends of the key section and adapted to take over bolts in the adjacent sections, and means for'finally securing together the other sections through the key section.

In testimony whereof I affix my signature.

ELMER J. BUN DY.

Washington, D. G. 

